Compact dual-band SIW filters loaded with double ring D-shaped resonators for sub-6 GHz applications

Abstract

In this paper, a compact substrate integrated waveguide (SIW) based dual-band filter which utilizes the dual resonance provided by asymmetric double-ring D-shaped resonators that are incorporated on the upper metallic layer of SIW is communicated. The two passbands are generated well below the cut-off frequency of the SIW due to evanescent mode propagation. Such propagation is responsible for the substantial miniaturization of the filter as well. Two types of two-pole dual-band filters are designed that exhibit low insertion loss, wide out-of-band-rejection, compact size, easy fabrication and integration with other microwave components. To validate the proposed idea, three filter prototypes working around 2.66 and 3.54 GHz are designed, fabricated for demonstration and experimentally tested. Parametric analysis is performed to verify the dependence of filter parameters on the proposed filter prototype. Expected agreements are achieved between the experimental and simulated results. The proposed filter finds applications in the upcoming 5G sub-6 GHz communication.

Keywords:

• Dual-band filter
• substrate integrated waveguide
• high selectivity
• D-shaped resonator

Acknowledgments

The authors express their gratitude to Mr. Purushothaman and his team from Mini-Circuits, SEZ, Tambaram, Chennai for providing measurement facilities to test the fabricated filter prototypes.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by National Natural Science Foundation of China [61471258] and University Key Research Project of Guangdong Province [2018KZDXM063].

Notes on contributors

D. Tharani

Tharani Duraisamy pursued her B.E. degree in Electronics and Communication Engineering from J.J. College of Engineering and Technology Tiruchirappalli, India in 2010. She completed her M.E. degree in Communication Systems from Saranathan College of Engineering, Tiruchirappalli, India in 2013. Later she joined as an Assistant Professor in Mookambigai College of Engineering, Pudukottai. In 2017, she started her research career as a Research Scholar in the Department of Electronics and Communication Engineering at the Indian Institute of Information Technology, Kancheepuram, India. Her research interest includes the design of SIW passive components such as power dividers, filters and diplexers. She is a student member of IEEE and IEEE MTT-S.

R. K. Barik

Rusan Kumar Barik received the B.Tech degree in Electronic & Communication Engineering from Biju Patnaik University of Technology, Rourkela, India in 2012, M.Tech degree in Communication Systems Design and a Ph.D. degree in Electronics Engineering from Indian Institute of Information Technology, Chennai, Tamil Nadu, India in 2015 and 2018, respectively. He joined the Department of Electronic & Communication Engineering, Christ University Bangalore, India, as an assistant professor in 2018. He is currently a Post-Doctoral Researcher with the Southern University of Science and Technology, Shenzhen, China. His research interests include multiband microwave passive devices, multiband antennas, and SIW components.

Q. S. Cheng

Qingsha S. Cheng received the B.Eng. and M.Eng. degrees from Chongqing University, Chongqing, China, in 1995 and 1998, respectively, and the Ph.D. degree from McMaster University, Hamilton, ON, Canada, in 2004. In 1998, he joined the Department of Computer Science and Technology, Peking University, Beijing, China. In 1999, he joined the Department of Electrical and Computer Engineering, McMaster University, where he worked as a postdoctoral fellow, a research associate, and a research engineer. He is currently an Assistant Professor with the Department of Electrical and Electric Engineering, Southern University of Science and Technology, Shenzhen, China. His research interests include surrogate modeling, CAD, modeling of microwave circuits, software design technology, and methodologies for microwave CAD.

K. Selvajyothi

Selvajyothi Kamakshy studied at Thangal Kunju Musaliar College of Engineering, Kollam, India and received the B. Tech degree (1995) in Electrical and Electronics Engineering from Kerala University, India. Received M.E degree (2004) in Power Electronics and Industrial Drives from Sathyabama Institute of Science and Technology, Chennai, India. She received a Ph.D degree in Electrical Engineering from the Indian Institute of Technology, Madras in 2009. Currently, she is an Assistant Professor in Electrical Engineering, Indian Institute of Information Technology Design and Manufacturing, Kancheepuram, India. She has 18 years of teaching experience including 11 years of research. Her areas of interest are Control and Instrumentation Engineering, Electric vehicles, Medical instrumentation, Power Electronics and control. Dr. Selvajyothi is a Life member of ISTE (Indian Society for Technical Education). She is a member of IEEE, IIIS (International Institute of Informatics and Systemics) and SAEINDIA.

S. S. Karthikeyan

Karthikeyan Sholampettai Subramanian received a Ph.D. degree from IIT Guwahati, India, in 2011. He has 13 years of educational activity and research experience in the area of RF and microwave. He was the Short-Term academic foreign visit U.K and France. He is currently an Assistant Professor with the Department of Electronics and Communication Engineering, National Institute of Technology, Tiruchirappalli, India. He has authored or co-authored more than 100 scientific research papers and technical reports. His current research interests include microwave integrated circuits, biological effects of microwaves, computer-aided design of MICS, metamaterials/frequency selective surfaces (FSSs), fractal antennas, MIC antennas, metamaterial antennas, and substrate-integrated waveguides. Dr. Karthikeyan is a Chair of the IEEE-APS Society Madras chapter. He is a member of the IEEE, IEEE MTT-S, and IEEE AP-S. He is a Life Member of the ISTE.